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  • 专利说明
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    • 专利摘要:
    MANUFACTURING METHOD AND CONFORMED BODY MANUFACTURING APPLIANCE THROUGH PRESSING The present invention relates to a manufacturing method and apparatus for manufacturing a body formed by pressing, and specifically, a manufacturing method and a manufacturing apparatus of a body formed by pressing made of a high tensile strength steel plate with a tensile strength of 390 MPa or more, with a cross-section with the approximate groove shape that includes a groove bottom part, parts of ridge lines continuous with respect to the groove bottom part, and side wall parts continuous with the ridge line parts, and in which an outward flange is formed at an end part in a longitudinal direction. The invention also relates to an apparatus for manufacturing a body formed by pressing
    公开号:BR112014031054B1
    申请号:R112014031054-8
    申请日:2013-06-20
    公开日:2020-07-28
    发明作者:Kenichiro Otsuka；Ryuichi Nishimura；Yoshiaki Kanazawa；Yoshihiko Masuo；Toshiya Suzuki；Yoshiyuki Ikeda
    申请人:Nippon Steel Corporation；
    IPC主号:
    专利说明:

    TECHNICAL FIELD
    [001] The present invention relates to a method of fabrication and an apparatus for fabricating a shaped body by pressing, and specifically, to a method of fabricating and an apparatus for fabricating a shaped body by pressing made of a high tensile strength steel plate with a tensile strength of 390 MPa or more, with an approximate groove-shaped cross section that includes a groove bottom part, continuous ridge line parts in relation to the bottom part groove, and side wall parts continuous to the ridge line parts, and in which an outward flange is formed at an end part in a longitudinal direction. BACKGROUND OF THE TECHNIQUE
    [002] A floor of a vehicle body (hereinafter referred to only as a "floor") is not only primarily responsible for torsional stiffness and curvature stiffness of a vehicle body in a vehicle travel time, but is also responsible for transferring an impact load during a collision, moreover, it affects widely on a vehicle body weight, and therefore is required to include both high rigidity and light weight antinomy characteristics. The floor includes flat panels (for example, an instrument panel, a front floor panel, a rear floor panel, and so on) which are welded to be joined together, long members (for example, a floor cross member, seat cross member, and so on) that have approximately groove-shaped cross sections which are fixed so that they are arranged in a vehicle width direction of these flat panels by welding to optimize rigidity and the strength of the floor, and the long limbs (a side sill, a side limb, and so on) that have approximately groove-shaped cross sections that are fixed so that they are arranged in a forward and backward direction of the vehicle to improve the stiffness and strength of the floor. For example, the floor cross member is normally joined to other members such as, for example, a tunnel part of the front floor panel and the side sill by means of outwardly shaped flanges on both end parts in a longitudinal direction.
    [003] Figure 12A and Figure 12B are explanatory views that illustrate a floor 1 cross member. Figure 12A is a perspective view, and Figure 12B is a view of arrow XII in Figure 12A.
    [004] In general, the floor cross member 1 is attached to an upper surface (a surface on an interior side) of a front floor panel 2. A floor is reinforced by that floor cross member 1 that engages a part of tunnel (not shown) shaped by approximately one-center plating in a wide direction of the front floor panel 2 and side sills 3 spot welded on both sides in a wide direction of the front floor panel 2. The member cross-sectional floor 1 has a cross-section with an approximate groove shape, and is welded to the side of the tunnel and the side sills 3 by means of outward flanges 4 formed on both end parts in a longitudinal direction thereof, and in this way, the floor stiffness and a load transfer characteristic when an impact load is applied is improved.
    [005] Figure 13A and Figure 13B are explanatory views that schematically illustrate a method of conventional pressing of the floor cross member 1. Figure 13A is the explanatory view that schematically illustrates the drawing in which the forming is performed during the application of a bonding force at one end of a material by an anti-wrinkle device. Figure 13B is the explanatory view that schematically illustrates curvature conformation using a developed sketch 6.
    [006] In pressing by the drawing illustrated in Figure 13A, an excess part 5a is formed into a pressing material 5, the excess part 5a being cut along a cutting line 5b and, after that, a flange 5c is erected. In addition, in the curvature forming press illustrated in Figure 13B, the curvature forming press is performed for developed sketch 6 which has a developed sketch format. The floor cross member 1 is conventionally shaped by pressing through the drawing shown in Figure 13A or pressing through the curvature forming shown in Figure 13B. From a point of view of improving the production of material, pressing by conformation by curvature is preferable to pressing by drawing accompanied by cutting the excess part 5a.
    [007] The floor cross member 1 is an important structural member that is responsible for improving the rigidity of the vehicle body and for absorbing the impact load during a lateral collision (lateral impact). Consequently, in recent years, a thinner, higher tensile strength steel sheet, for example, a high tensile strength steel sheet with a tensile strength of 390 MPa or more (a steel sheet high strength or an HSS [high tensile strength steel]) was used as a material of the floor 1 cross member from the point of view of reducing weight and improving collision safety. However, the plasticity of the high tensile steel sheet is not good, and therefore it is a problem that the design flexibility of the floor cross member 1 is low.
    [008] It is concretely described with reference to Figure 12A and Figure 12B. It is desirable to shape the continuous flange outwardly 4 across a periphery of an end part of the floor cross member 1, and to obtain a flange width with a certain degree of length to optimize the strength and torsional stiffness of the joint between the floor cross member 1 and the tunnel part of the front floor panel 2, the side sills 3, and to optimize the rigidity of the floor and the load transfer characteristic during a collision.
    [009] However, it is difficult to obtain a desired shape when the continuous outward flange 4 is formed across the periphery of the end part of the floor cross member 1, and to obtain the flange width with the given degree of length due to the fact that basically flange cracks occur by stretching in a flange part that corresponds to an outer periphery of a ridge line part of the outward flange 4 (hereinafter referred to as a "ridge line part flange portion ") and wrinkling in a part of proximity 1 b of the flange out 4 in a part of line ridge 1a. Such conformation failures are easy to occur as long as a material resistance of the floor cross member 1 is higher, and as long as a flange extension rate in the conformation of a flange portion of the ridge line part 4a of the flange outward 4 is higher (namely, for example, while a wall angle in cross-section 0 in Figure 12B is more accentuated, or while a flange height is higher).
    [0010] The floor cross member 1 tends to have high strength to reduce the weight of the vehicle body, and tends to be designed for a shape with a high rate of flange extension from a performance point of view and a shape partly joint with other members, and therefore the conformation of the continuous outward flange 4 which includes the ridge line part flange portion 4a is difficult to be activated by the conventional pressing method. Consequently, it is the present situation in which cutouts cannot be provided on the flange portion of the crest line part 4a of the flange out 4 of the floor cross member 1 made of the high tensile steel sheet as shown in Figure 12A and in Figure 12B from restrictions in the pressing technology as stated above even if the reduction in the performance of the floor cross member 1 is accepted.
    [0011] In Patent Literature 1 to 3, the inventions are described, in which a failure of format fixation in a pressing product of high strength material is solved by elaborating a damping mechanism of a forming tool of metal although not intended for forming the floor cross member 1. These inventions are those in which deflection is intentionally generated in a material during forming by a position relationship of the block that presses at least a portion of a part (part groove bottom) where a punch top part and a punch top part face each other, in order to enable the enhancement in the fixation format after forming. LIST OF QUOTES PATENT LITERATURE
    [0012] Patent Literature 1: Patent Publication No. JP 4438468
    [0013] Patent Literature 2: Patent Publication Open to Public Inspection No. jp 2009-255116
    [0014] Patent Literature 3: Publication of Patent Open to Public Inspection No. JP 2012-051005 SUMMARY OF THE INVENTION TECHNICAL PROBLEM
    [0015] It is difficult to shape the floor cross member 1, which is a body formed by pressing made of a steel sheet with high tensile strength of 390 MPa or more, with a cross-section with the approximate groove shape that includes a groove bottom part, ridge line parts, and side wall parts, and in which an outward flange is formed into a strip through at least a portion of each ridge line part, from the bottom part groove and side wall part on both sides of the ridge line part from one end part in a longitudinal direction without providing indentations in the ridge line part flange portion 4a of the flange outward 4 or without generating reduction of material production, even if the conventional inventions described in Patent Literature 1 to 3 are based.
    [0016] An objective of the present invention is to provide a method and an apparatus that manufactures a shaped body by pressing such as, for example, a floor cross member made of a high tensile steel sheet of 390 MPa or more, with an approximate groove-shaped cross section that includes a groove bottom part, ridge line parts, and side wall parts, and in which an outward flange is shaped into a strip through at least a portion of each of the ridge line parts, the groove bottom part and the side wall part on both sides of it, from one end part in a longitudinal direction without providing cutouts in a flange part of the line part flange ridge out or without reducing material production. SOLUTION TO THE PROBLEM
    [0017] The present invention is as mentioned below.
    [0018] [1] A method of manufacturing a shaped body by pressing made from a high tensile strength steel sheet of 390 MPa or more, with a cross-section with the approximate groove shape that includes a bottom part groove parts, continuous ridge line parts relative to the groove bottom part, and continuous side wall parts to the ridge line parts, and in which an outward flange is formed into a strip through at least a portion of each of the crest line parts, the groove bottom part and the side wall part on both sides of it, from an end part in a longitudinal direction by carrying out a pressing of a press material through a pressing apparatus that includes a punch, a die, and a block that presses and connects the pressing material to the punch, the manufacturing method including: a first step of carrying out the pressing while the block connects a part that gives it must be formed in the groove bottom part and at least a portion of a part that must be formed in the ridge line part in the pressing material; and a second stage of pressing parts that are not capable of being formed by the first stage.
    [0019] [2] The method of fabricating the body formed by pressing according to [1], in which the block connects a part that is one third or more than one peripheral length in cross section of the line part ridge that starts from a connection part with the groove bottom part.
    [0020] [3] The method of fabricating the body formed by pressing according to [1] or [2], in which the block connects the part that must be conformed to the ridge line part in a predetermined range from from a root portion of the flange outwardly in a direction in which the ridge line part extends in a longitudinal direction of the part that is to be conformed to the ridge line part.
    [0021] [4] The method of manufacturing the shaped body by pressing according to any one of [1] to [3], in which the shaped body by pressing has a cross-section with an approximate groove shape that additionally includes continuous curved parts to the side wall parts, and continuous flanges to the curved parts.
    [0022] [5] The method of manufacturing the body formed by pressing according to any one of [1] to [4], in which the pressing is conformed by curvature.
    [0023] [6] The method of manufacturing the body conformed by pressing according to any one of [1] to [4], in which the pressing is drawing.
    [0024] [7] An apparatus for manufacturing a body formed by pressing, which manufactures the body formed by pressing made of a steel sheet of high tensile strength of 390 MPa or more, with a cross-section with the shape approximate groove that includes a groove bottom part, continuous crest line parts in relation to the groove bottom part, and side wall parts continuous to the crest line parts, and in which an outward flange is formed into a strip through at least a portion of each of the ridge line parts, the groove bottom part and the side wall part on both sides of it, between an end part in a longitudinal direction, the manufacturing apparatus includes: a punch; a matrix; and a block that presses and connects a press material to the punch, wherein the block has a shape that connects a part that must be formed in the groove bottom part and at least a portion of a part that must be shaped in the part of ridge line in the pressing material.
    [0026] [8] The apparatus for manufacturing the body formed by pressing in accordance with [7], in which the block has a shape that connects a part that is one third or more than one peripheral length in cross section the crest line part that starts from a connection part with the groove bottom part.
    [0027] [9] The body fabrication apparatus conformed by pressing according to [7] or [8], in which the block connects the part that must be conformed to the crest line part in a predetermined range from from a root portion of the flange outwardly in a direction in which the ridge line part extends in a longitudinal direction of the part that is to be conformed to the ridge line part.
    [0028] [10] The apparatus for manufacturing the body formed by pressing according to any one of [7] to [9], in which the body formed by pressing has a cross-section with an approximate groove shape which additionally includes continuous curved parts to the side wall parts, and continuous flanges to the curved parts.
    [0029] [11] The apparatus for manufacturing the body conformed by mechanical pressing according to any one of [7] to [10], in which the mechanical pressing is conformed by curvature.
    [0030] [12] The apparatus for manufacturing the body conformed by mechanical pressing according to any of [7] to [10], in which the mechanical pressing is drawing.
    [0031] It should be noted that the block according to the inventions described in Patent Literature 1 to 3 is one for conceiving a position relationship between a punch top part and the block that presses at least a portion of a part (groove bottom part) facing the punch top part, and the block according to the present invention is different from the inventions disclosed in Patent Literature 1 to 3 at a point in which the block has a shape that intentionally presses also the crest line part. ADVANTAGE EFFECTS OF THE INVENTION
    [0032] According to the present invention, it is possible to safely form a shaped body by pressing made of a steel sheet with high tensile strength of 390 MPa or more, with a cross-section with the approximate groove shape that includes a groove bottom part, ridge line parts, and side wall parts, and in which an outward flange is formed into a strip across the ridge line part, at least a portion of each of the bottom parts of groove and the side wall parts on both sides of it, from one end part in a longitudinal direction without providing cutouts in a flange portion of the crest line part of the flange outwards or without reducing material production. BRIEF DESCRIPTION OF THE DRAWINGS
    [0033] Figure 1A is a view that schematically illustrates a schematic configuration of an apparatus for manufacturing a shaped body by pressing according to a modality and a first stage;
    [0034] Figure 1B is a cross-sectional view illustrating a cross-sectional shape of a body formed by pressing made in the present embodiment;
    [0035] Figure 1C is a perspective view that illustrates a configuration around a block of ridge line in the first step;
    [0036] Figure 1D is a view of when the body formed by pressing manufactured in the present modality is seen from a lateral side in a longitudinal direction;
    [0037] Figure 2A is a perspective view of a shaped body by pressing an analysis example 1;
    [0038] Figure 2B is a view of arrow II in Figure 2A;
    [0039] Figure 2C is a cross-sectional view of the shaped body by pressing the example of analysis 1;
    [0040] Figure 3A is a perspective view that illustrates a punch, a die, and a pressing material at a moment of shaping according to the invented method;
    [0041] Figure 3B is a perspective view illustrating the punch, a block of ridge line, and the pressing material at the moment of forming according to the invented method;
    [0042] Figure 3C is an enlarged perspective view illustrating a square part encircled in Figure 3B;
    [0043] Figure 3D is a sectional view III-III in Figure 3C;
    [0044] Figure 4A is a perspective view that illustrates a punch, a die, a block, and a pressing material in a shaping moment according to a conventional method;
    [0045] Figure 4B is a perspective view illustrating the punch, the block, and the pressing material at the moment of forming according to the conventional method;
    [0046] Figure 4C is an enlarged perspective view showing a square part encircled in Figure 4B;
    [0047] Figure 5A is a characteristic diagram illustrating a result of numerical analysis of a relationship between a pressing angle of the pressing material by the block and a maximum value of a decrease in plate thickness at an end portion of a portion flange part of the ridge line of a flange out in analysis example 1;
    [0048] Figure 5B is a view that illustrates evaluation positions (a part with risk of cracking) of the decrease in plate thickness that is the object of evaluation in analysis example 1;
    [0049] Figure 6A is a perspective view of a shaped body by pressing an analysis example 2;
    [0050] Figure 6B is a VI seen from the arrow in Figure 6A;
    [0051] Figure 6C is a cross-sectional view of the shaped body by pressing the example of analysis 2;
    [0052] Figure 7A is a perspective view illustrating a punch, a die, a block of ridge line, and a pressing material in a forming moment according to the invented method;
    [0053] Figure 7B is a perspective view that illustrates the punch, the ridge line block, and the pressing material at the moment of forming according to the invented method;
    [0054] Figure 7C is an enlarged perspective view illustrating a square part encircled in Figure 7B;
    [0055] Figure 7D is a VII-VII sectional view in Figure 7C;
    [0056] Figure 8A is a perspective view that illustrates a punch and a die at a moment of conformation according to the conventional method;
    [0057] Figure 8B is a perspective view illustrating the punch, a block, and a pressing material at the moment of forming according to the conventional method;
    [0058] Figure 8C is an enlarged perspective view illustrating a square part encircled in Figure 8B;
    [0059] Figure 9A is a characteristic diagram that illustrates a result of numerical analysis of a relationship between a pressing angle of the pressing material by the block and a minimum value of decreasing plate thickness in an adjacency of a root portion of a flange portion of the ridge line portion of an outward flange in analysis example 2;
    [0060] Figure 9B is a view that illustrates evaluation positions (a part with risk of wrinkling) of the decrease in plate thickness that is the object of evaluation in analysis example 2;
    [0061] Figure 10A is a perspective view of a shaped body by pressing an analysis example 3;
    [0062] Figure 10B is a view of the arrow X in Figure 10A;
    [0063] Figure 10C is a cross-sectional view of the shaped body by pressing the example of analysis 3;
    [0064] Figure 11A is a view to explain a maximum value of a decrease in plate thickness in evaluation positions (a part with risk of cracking) of a decrease in plate thickness according to the invented method;
    [0065] Figure 11B is a view to explain a maximum value of a decrease in plate thickness in evaluation positions (a part with risk of cracking) of a decrease in plate thickness according to the conventional method;
    [0066] Figure 12A is a perspective view of a floor cross member;
    [0067] Figure 12B is a view of arrow XII in Figure 12A;
    [0068] Figure 13A is an explanatory view that schematically illustrates the drawing; and
    [0069] Figure 13B is an explanatory view that schematically illustrates curvature conformation. DESCRIPTION OF THE MODALITIES
    [0070] Hereinafter, the modalities of the present invention are described with reference to the accompanying drawings.
    [0071] Figure 1A to Figure 1D are explanatory views that conceptually illustrate features of a manufacturing method and an apparatus for manufacturing a body shaped by pressing according to a modality in which the present invention is applied. Figure 1A is a view that schematically illustrates a schematic configuration of the apparatus for fabricating the shaped body by pressing according to the modality and a first stage. Figure 1B is a cross-sectional view illustrating a cross-sectional shape of the body formed by pressing made in the present embodiment. Figure 1C is a perspective view illustrating a configuration around a ridge line block in the first step. Figure 1D is a view of when the body formed by pressing manufactured in the present embodiment is seen from a lateral side in a longitudinal direction. It should be noted that in each of Figure 1B and Figure 1D, a plate thickness is represented by a thick line. 1. Body conformed by pressing
    [0072] As illustrated in Figure 1B, the body formed by pressing manufactured in the present modality is a body formed by pressing 15 which is long and made of a steel sheet of high tensile strength of 390 MPa or more, which has a roughly shaped groove cross section including a groove bottom part 15a, ridge line parts 15b, 15b continuous with respect to the groove bottom part 15a, side wall parts 15c, 15c continuous to the line parts ridge 15b, 15b, curved parts 15d, 15d continuous to side wall parts 15c, 15c, and flanges 15e, 15e continuous to curved parts 15d, 15d. An outward flange 16 is shaped across a periphery of an end part in a longitudinal direction, namely, along the groove bottom part 15a, the ridge line parts 15b, 15b, the side wall parts 15c, 15c, the curved parts 15d, 15d, and the flanges 15e, 15e.
    [0073] The press-shaped body 15 manufactured in the present embodiment is a press-shaped body that does not have cutouts in a flange portion of the crest line part 16a of the flange 16 different from that shown in Figure 12A, Figure 12B.
    [0074] In addition, the press-shaped body 15 manufactured in the present embodiment has a flange cross-section of 20 mm or more. In addition, from a point of view of attaching a continuous region for welding such as spot welding, laser welding, or plasma welding, an outward flange width 16 is approximately 5 mm or more on a flat part of the flange at least part of the groove bottom part 15a, the ridge line part 15b, and the side wall part 15c. In addition, on the ridge line part 15b, the flange width is approximately 2 mm or more from a point of view of fastening performances such as impact characteristics, torsional stiffness even if the joint is not made.
    [0075] It should be noted that, in the present embodiment, a body conformed by hat-shaped pressing that has a cross-section with an approximate groove shape illustrated in Figure 1B is described, but the present invention is applicable as long as it is a body formed by pressing having a cross-section with an approximate groove shape that includes at least the groove bottom part 15a, the ridge line parts 15b, 15b, and the side wall parts 15c, 15c.
    [0076] Furthermore, an example in which the outward flange 16 is shaped along the entire periphery at the end part in the longitudinal direction is described, but the present invention is applicable as long as it is a body formed by pressing in which the flange outward 16 which includes the flange portion of the ridge line part 16a is shaped, in other words, the outward flange 16 is shaped into a strip across the ridge line part 15b, of at least a portion of each the groove bottom parts 15a and the side wall part 15c on both sides thereof. 2. Apparatus for manufacturing the shaped body by pressing (pressing apparatus)
    [0077] As illustrated in Figure 1A, a pressing apparatus 10 includes a punch 11, a die 12, and a block 14 that presses and connects a pressing material 13 to the punch 11. In the present embodiment, block 14 must connect non only a part that must be formed in the groove bottom part 15a but also parts that must be formed in the ridge line parts 15b, 15b in the pressing material 13, and is called a ridge line block.
    [0078] The ridge line block 14 has a shape that connects the part that must be formed in the groove bottom part 15a and the parts that must be formed in the ridge line parts 15b, 15b in an adjacency of the flange for out 16 in the press material 13.
    [0079] A publicly known block connects the part that is to be conformed to the groove bottom part 15a, but does not connect the parts that are to be conformed to the crest line parts 15b, 15b. On the other hand, the ridge line block 14 connects not only the part that must be formed in the groove bottom part 15a but also the parts that must be formed in the ridge line parts 15b, 15b in the vicinity of the outward flange 16. According to the ridge line block 14, a ridge line block shape 14 is approximately shaped by stretching only one material in that part. The movement of the material around a part in which the block of ridge line 14 is in contact is thus suppressed, the deformations of expansion and shrinkage of a peripheral material that must a factor of cracks and wrinkles are suppressed, and therefore , it is possible to reduce occurrences of flange cracks by stretching the flange portion of the ridge line part 16a of the flange 16 and wrinkling in a part close to the flange 16 (refer to a part close 1b in Figure 12A) in crest line part 15b.
    [0080] The ridge line block 14 is objectified by an effect that suppresses the movement of the peripheral material through the stretching and conformation of the shape of the ridge line part 15b in the vicinity of the flange outward 16. Consequently, it is desirable to connect a part having a length of one third or more of a peripheral cross-sectional length of the ridge line parts 15b, 15b starting from a connecting part 15a ab among the part that is to be formed in the ridge line part 15b, more preferably to connect a peripheral length in cross-section all of the part that must be conformed to the ridge line part 15b. In that case, if it has a degree shape in which only a single part of the side wall part 15c, for example, a part of the side wall part 15c that is 20 mm or less in length in addition to the line part of ridge 15b are pressed, a problem in which a block load is insufficient and cannot resist pressing is difficult to occur, and therefore is acceptable as a block in the present invention.
    [0081] Furthermore, it is preferable that a strip connected by the ridge line block 14 in a longitudinal direction of the part to be formed in the ridge line part 15b ("I" illustrated in Figure 1D) should be adjacent to the flange outward 16, in other words, at least a portion of a predetermined strip of a root portion of the outward flange 16 in a direction in which the ridge line part 15b extends. The predetermined range is defined to be the same degree as a flange width of the ridge line part flange portion 16a of the flange outward 16. For example, when the flange width of the ridge line part flange portion 16 of the flange out 16 is 20 mm, the predetermined range will be set to be approximately 20 mm and when the flange width of the flange portion of the ridge line part 16a is 30 mm, the predetermined range will be set to be approximately 30 mm. In this case, it is not necessary to connect the part to be formed on the ridge line part 15b over an entire area of that predetermined range and it is not a problem if a part of the predetermined range is connected.
    [0082] Other elements such as a size and material of the ridge line block 14 in addition to the materials mentioned above may be the same as a publicly known block. 3. Method of manufacturing a shaped body by pressing
    [0083] In the pressing forming machine 10, the pressing forming is carried out while connecting the part to be formed in the groove bottom part 15a and the parts to be formed in the ridge line parts 15b, 15b in the vicinity of the flange out 16 in the forming material by pressing 13 using the ridge line block 14.
    [0084] To form the parts that cannot be formed by this forming by pressing (a first forming step by pressing), a second forming step by pressing which is a post-step is performed. The part that cannot be formed by the first forming step by pressing is concretely a part that is positioned directly below the ridge line part 15b which is connected through the ridge line block 14 as represented by the oblique lines in Figure 1D . The second step of forming through pressing, which is the post-step, is performed to form the part represented by the oblique lines in Figure 1D, in other words, the parts to be formed in a part of the side wall parts 15c, 15c, parts to be formed on a part of the curved parts 15d, 15d and the parts to be formed on a part of the flanges 15e, 15e.
    [0085] In the second stage of forming by pressing, the forming through pressing can be one that uses only a die and a punch without using the block (forming through pressing) or it can be the forming by bending with the use the block.
    [0086] It is observed that there is a case when a remaining part of the part to be formed on the crest line part 15b that cannot be formed by the first forming step by pressing exists depending on the region connected by the crest line block 14. In this case, the remaining part of the part which is formed on the ridge line part 15b is also formed by mechanical pressing by the second forming step by pressing. For example, when one-third of the part to be formed on the crest line part 15b is formed by the first forming step by pressing, the remaining two-thirds of that of the part to be formed on the crest line part 15b are formed by the second stage of forming through pressing.
    [0087] As mentioned above, the forming material by pressing 13 is formed by pressing (the first forming step by pressing, the second forming step by pressing) by the forming apparatus by pressing which includes the punch 11, the matrix 12 and the ridge line block 14 which presses and connects the forming material by pressing 13 to the punch 11 and, thus, it is possible to manufacture the shaped body through pressing 15 which is long and made of the sheet of high-tensile strength steel of 390 MPa or more which has approximately a groove-shaped cross section that includes the groove bottom part 15a, the ridge line continuous parts 15b, 15b to the groove bottom part 15a, the continuous side wall parts 15c, 15c to the ridge line parts 15b, 15b, the continuous curved parts 15d, 15d to the side wall parts 15c, 15c and the continuous flanges 15e, 15e to the curved parts 15d, 15d, wherethe outward flange 16 is shaped along the entire periphery of the end part in the longitudinal direction shown in Figure 1B.
    [0088] A concave and convex shaped part of 0.1 mm or more is observed and is formed into a boundary part between the crest line part 15b and the side wall part 15c that corresponds to the end part of the block ridge line 14 at the moment of forming through pressing due to the fact that twice forming through mechanical pressing is performed.
    [0089] In the present document below, one reason why forming by pressing is carried out by connecting not only the part to be formed in the bottom part of out of groove 15a, but also the parts to be formed in the parts of ridge line 15b, 15b in the vicinity of the flange 16 using the ridge line block 14 is described with reference to a numerical analysis result using a finite element method. ANALYSIS EXAMPLE 1
    [0090] Figure 2A to Figure 2C are explanatory views that illustrate a shape of a shaped body through pressing 20 of an analysis example 1. Figure 2A is a perspective view of the shaped body through pressing 20, Figure 2B is an arrow view II in Figure 2A and Figure 2C is a cross-sectional view of the shaped body by pressing 20 (an outward flange 20f is not shown).
    [0091] The body formed by pressing 20 of analysis example 1 is made of a sheet of high strength steel (steel of class DP (Double Phase) with resistance of 590 MPa) and its sheet thickness is 1, 4 mm.
    [0092] The press shaped body 20 includes a groove bottom part 20a, continuous crest line parts 20b, 20b to the groove bottom part 20a, continuous side wall parts 20c, 20c to the crest line parts 20b, 20b, continuous curved parts 20d, 20d to side wall parts 20c, 20c and continuous flanges 20e, 20e to curved parts 20d, 20d. A radius of curvature on an inner sheet side of the ridge line parts 20b, 20b is 12 mm.
    [0093] Outward flanges 20f are formed on an entire periphery of both end parts in a longitudinal direction of the shaped body by pressing 20 and a flange portion of ridge line part 20g becomes a curved portion. A flange width of the outward flange 20f is 25 mm in a shaped part along the groove bottom part 20a and 30 mm in a shaped part along the side wall parts 20c, 20c.
    [0094] A cross-sectional wall angle of the body conformed by pressing 20 is 70 degrees and a cross-sectional height is 100 mm. In analysis example 1, the body formed by pressing 20 is manufactured by forming through pressing through curvature forming with the use of a developed raw block.
    [0095] Figure 3A is a perspective view that illustrates a punch (lower forming tool) 21, a matrix (upper forming tool) 22 and a forming material by pressing 24 in a forming instant according to the invented method. Figure 3B is a perspective view illustrating the punch (bottom forming tool) 21, a ridge line block 25 and the forming material by pressing 24 at the forming time according to the invented method. Figure 3C is a perspective view that enlarges a part surrounded by a square in Figure 3B. Figure 3D is a sectional view III-II in Figure 3C.
    [0096] On the other hand, Figure 4A is a perspective view that illustrates a punch (lower forming tool) 21, a matrix (upper forming tool) 22, a block 23 and a forming material by pressing 24 in an instant of conformation according to a conventional method. Figure 4B is a perspective view illustrating the punch (bottom forming tool) 21, the block 23 and the forming material through pressing 24 at the forming time according to the conventional method. Figure 4C is a perspective view that enlarges a part surrounded by a square in Figure 4B.
    [0097] Figure 5A is a characteristic diagram that illustrates a result of numerical analysis of a relationship between a pressing angle of the forming material through pressing 24 through blocks 23, 25 and a maximum value of a sheet thickness decreases by an end part of the ridge line part flange portion 20g of the outward flange 20f formed on the shaped body by pressing 20. In Figure 5B, the evaluation positions of a decreased sheet thickness are illustrated (surrounded bands, each, by a dashed line, a crack treatment part) which are objects of evaluation in the analysis example 1. The pressing angle means a central angle of a strip of the crest line part 20b connected by blocks 23, 25 while defining a position of a connecting part with the groove bottom part 20a as "0" (zero) degree from between a part to be formed on the ridge line part 20b in the forming material through Pressing 24. In addition, as a decrease in the maximum value of the sheet thickness becomes greater, stretching flange cracks occur.
    [0098] In the conventional method, in other words, in curvature forming with the use of normal block 23, block 23 connects all or just a part of the part to be formed in the groove bottom part 20a in the forming material through of press 24 as shown in Figure 4A to Figure 4C. In other words, it is a shape in which a part to be formed on the ridge line part 20b is not connected and the pressing angle is "0" (zero) degree.
    [0099] In this case, as shown in Figure 5A, a maximum value if the sheet thickness decreases at the end part of the 20g ridge line part flange portion is a value of approximately 36% that exceeds much more than 30% and it can be seen that the possibility of stretching flange cracking occurring is high.
    [00100] On the other hand, in the invented method, in other words, in curvature conformation with the use of the ridge line block 25, as illustrated in Figure 3A to 3D Figure, the ridge line block 25 connects the part to be formed on the ridge line part 20b in addition to the part to be formed on the bottom groove part 20a in an adjacency of the outward flange 20f (a strip within 10 mm from a root part of the outward flange 20f in a direction in which the ridge line part 20b extends).
    [00101] Then, the analyzes are performed under the conditions in which a region where the block of ridge line 25 connects the forming material through pressing 24 is altered by one-third, two-thirds and a total of a peripheral length in cross-section of the ridge line part 20b starting from a connecting part from between the part to be formed in the ridge line part 20b.
    [00102] In this case, as illustrated in Figure 5A, it can be seen that a decrease in maximum value of the sheet thickness in the flange portion of part of ridge line 20g is suppressed according to the region where the block of ridge line 25 connects the forming material through pressing 24 (pressing angle) becomes larger. In particular, a suppression effect is noticeable when the connection region is one-third or more and it is possible to avoid stretching flange cracks. ANALYSIS EXAMPLE 2
    [00103] Figure 6A to Figure 6C are explanatory views illustrating a shape of a shaped body through pressing 30 of an analysis example 2. Figure 6A is a perspective view of the shaped body through pressing 30, Figure 6B is an arrow view VI in Figure 6A and Figure 6C is a cross-sectional view of the shaped body by pressing 30 (an outward flange 30f is not shown).
    [00104] The body formed by pressing 30 of analysis example 2 is made of high-strength steel sheet (steel class DP with a resistance of 590 MPa) and a sheet thickness of the same is 1.4 mm.
    [00105] The press shaped body 30 includes a groove bottom part 30a, continuous ridge line parts 30b, 30b to the groove bottom part 30a, continuous side wall parts 30c, 30c to the ridge line parts 30b, 30b, continuous curved parts 30d, 30d to side wall parts 30c, 30c and continuous flanges 30e, 30e to curved parts 30d, 30d. A radius of curvature on an inner sheet side of the ridge line parts 30b, 30b is 12 mm.
    [00106] The outward flange 30f is formed into an entire periphery of both end parts in a longitudinal direction of the shaped body by pressing 30 and a flange portion of the ridge line part 30g becomes a curved portion. A flange width of the outward flange 30f is 20 mm in a shaped part along the bottom groove part 30a and 25 mm in a shaped part along the side wall parts 30c, 30c.
    [00107] A cross-sectional wall angle of the body conformed by pressing 30 is 82 degrees and a cross-sectional height is 60 mm. In analysis example 2, the body formed by pressing 30 is manufactured by forming through pressing through curvature forming with the use of a developed raw block.
    [00108] Figure 7A is a perspective view illustrating a punch (lower forming tool) 31, a matrix (upper forming tool) 32, a ridge line block 35 and a forming material through pressing 34 in an instant of conformation according to the invented method. Figure 7B is a perspective view illustrating the punch (bottom forming tool) 31, the ridge line block 35 and the forming material by pressing 34 at the shaped moment according to the invented method. Figure 7C is a perspective view that enlarges a part surrounded by a square in Figure 7B. Figure 7D is a sectional view VII-VII in Figure 7C.
    [00109] On the other hand, Figure 8A is a perspective view that illustrates a punch (lower forming tool) 31, a matrix (upper forming tool) 32 in an instant of forming according to the conventional method. Figure 8B is a perspective view illustrating the punch (bottom forming tool) 31, a block 33 and a forming material through pressing 34 at the forming point according to the conventional method. Figure 8C is a perspective view that enlarges a part surrounded by a square in Figure 8B.
    [00110] Figure 9A is a characteristic diagram that illustrates a result of numerical analysis of a relationship between a pressing angle of the forming material through pressing 34 by blocks 33, 35 and a minimum value of a sheet thickness decreases by one adjacency of a root part of the flange portion of the ridge line part 30g of the outward flange 30f shaped on the shaped body by pressing 30. In Figure 9B, the evaluation positions of a sheet thickness are shown to be reduced (surrounded bands , each, by a dashed line, a wrinkle treatment part) which are the objects of evaluation in analysis example 2. The pressing angle means that a central angle of a strip of the crest line part 30b connected by the blocks 33, 35 while defining a connection part with the groove bottom part 30a as "0" (zero) degree from between a part to be formed in the ridge line part 30b in the forming material a by pressing 34. In addition, as a decrease in the minimum value of the sheet thickness becomes smaller, a possibility in which the wrinkling occurs becomes high.
    [00111] In the conventional method, in other words, in curvature forming using the normal block 33, the block 33 connects only a part to be formed in the bottom groove part 30a in the forming material through pressing 34 as illustrated in Figure 8A to Figure 8C. In other words, it is a shape in which a part to be formed on the ridge line part 30b is not connected and the pressing angle is "0" (zero) degree.
    [00112] In this case, as shown in Figure 9A, a minimum value of the sheet thickness decreases at the root part of the flange portion of the 30g ridge line part is a value of approximately -65% and it is obvious that the wrinkling occurs in a proximity part 30b-1 of the flange 30f in the ridge line part 30b.
    [00113] On the other hand, in the invented method, in other words, in curvature conformation using the ridge line block 35, as illustrated in Figure 7A to Figure 7D, the ridge line block 35 connects the part to be shaped on the ridge line part 30b in addition to the part to be shaped on the bottom groove part 30a in an adjacency of the outward flange 30f (a strip within 10 mm from a root part of the outward flange 30f in a direction where the ridge line part 30b extends).
    [00114] Then, the analyzes are carried out under the conditions in which a region where the block of ridge line 35 connects the forming material through pressing 34 is changed by one-third, two-thirds, an integer of a peripheral length in cross-section of the ridge line part 30b starting from a connecting part from between the part to be formed in the ridge line part 30b.
    [00115] In this case, as shown in Figure 9A, it can be seen that the thickening in the proximity part 30b-1 of the flange 30f in the ridge line part 30b is suppressed since the region where the ridge line block 35 connects the forming material through pressing 34 (pressing angle) becomes larger. In the analysis result, a greater amount of thickening is due to the fact that it is originally a format that is difficult to suppress wrinkling. Therefore, it is desired to suppress a thickening rate to be less than 20% by defining the region connecting the ridge line part 30b to be two-thirds or more, but even when the region connecting the ridge line part 30b is approximately one-third or more, the thickening of a part where there is concern about the occurrence of wrinkling is suppressed to be half or less compared to the normal block and it can be seen that a thickening suppression effect by the ridge line block 35 is quite large. ANALYSIS EXAMPLE 3
    [00116] In each of the analysis examples 1, 2, a cold-rolled steel sheet is described, but the present invention is capable of being applied to a hot-rolled steel sheet.
    [00117] Figure 10A to Figure 10C are explanatory views illustrating a shape of a shaped body through pressing 40 of an analysis example 3. Figure 10A is a perspective view of the shaped body through pressing 40, Figure 10B it is an arrow view X in Figure 10A and Figure 10C is a cross-sectional view of the shaped body by pressing 40 (an outward flange 40f is not shown).
    [00118] The body formed by pressing 40 of analysis example 3 is made of high-strength steel sheet (steel grade DP 590 MPa) and a sheet thickness of the same is 2.9 mm.
    [00119] The press shaped body 40 includes a groove bottom part 40a, continuous ridge line parts 40b, 40b to the groove bottom part 40a and continuous side wall parts 40c, 40c to the ridge line parts 40b, 40b.
    [00120] The outward flange 40f is formed on an entire periphery of both end parts in a longitudinal direction of the shaped body by pressing 40 and a flange portion of the ridge line part 40g becomes a curved portion.
    [00121] A cross-sectional wall angle of the body conformed by pressing 40 is 82 degrees and a cross-sectional height is 50 mm. In analysis example 3, the body formed by pressing 40 is manufactured by forming through pressing through curvature forming with the use of a developed raw block.
    [00122] Also in analysis example 3, the conventional method using the block in which a part to be formed in the groove bottom part 40a is connected, but the parts to be formed in the ridge line parts 40b, 40b are not connected and the method invented using a ridge line block in which not only the part to be formed in the groove bottom part 40a, but also the parts to be formed in the ridge line parts 40b, 40b in the vicinity of the flange outward 40f are connected are compared.
    [00123] As illustrated in Figure 11B, in the conventional method,
    [00124] a decrease in the maximum value of the sheet thickness in the positions of assessment of the sheet thickness decreases (bands surrounded, each one, by a dashed line, a crack treatment part) is a value of approximately 20%. On the other hand, in the invented method, a decrease in the maximum value of the sheet thickness in the positions of assessment of the sheet thickness decreases (surrounded bands, each one, by the dashed line, a crack treatment part) is suppressed to a value approximately 14%.
    [00125] As mentioned above, the present invention is described with several modalities, but the present invention is not limited to just those modalities and modifications and so on within a range of the invention are possible.
    [00126] For example, in each of the analysis examples, a case in which the conformation through pressing is the conformation by curvature is exemplified, but the present invention is not limited to the same and the conformation through pressing may be drawing.
    [00127] In addition, a mode in which the lower forming tool is constituted by the punch and the upper forming tool is constituted by the matrix and the block is exemplified, but the present invention is not limited to the mode. It goes without saying that a structure in which the upper and lower metal forming tools are reversed, in other words, the upper forming tool is constituted by the punch and the lower forming tool is constituted by the die and the block is acceptable. INDUSTRIAL APPLICABILITY
    [00128] The present invention can be used to manufacture a shaped body by pressing made from a sheet of high tensile strength steel of 390 MPa or more that has approximately a groove-shaped cross section that includes a bottom part of groove, continuous parts of the ridge line to the bottom groove part and continuous parts of the side wall to the ridge line parts and in which an outward flange is formed into a strip across the ridge part, at least a portion of each one of the groove bottom part and the side wall part on both sides of it, from between an end part in a longitudinal direction, without being limited to a floor cross member.
    权利要求:
    Claims (6)
    [0001]
    1. Method of manufacturing a shaped body by pressing, characterized by the fact that it is made of a sheet of high tensile strength steel of 390 MPa or more that has approximately a cross-section in the shape of a groove that includes a part of groove bottom (15a), the ridge line parts (15b) continuous in relation to the ridge bottom part (15a), and the side wall parts (15c) continuous to the ridge line parts (15b), and wherein an outward flange (16) is formed in a strip across the ridge line part (15b), at least a portion of each between the groove bottom part (15a) and the side wall part (15c ) on both sides of the same, from an end part in a longitudinal direction, forming by pressing a forming material through pressing by means of a forming device using a press that includes a punch (11) , a matrix (12) and a block (14) that presses and connects the ma forming material by pressing the punch (11), the manufacturing method comprising: a first step of carrying out the forming by pressing while the block (14) connects a part to be formed in the groove bottom part and the minus a portion of a part to be formed on the ridge line part (15b) in the forming material by pressing; and a second step of carrying out the forming by pressing the parts that are not capable of being formed through the first step, in which the block (14) connects the part to be formed in the ridge line part (15b) within a predetermined strip from an outward flange root portion (16) in a direction in which the ridge line part (15b) extends in a longitudinal direction of the part to be shaped in the ridge line part (15b) .
    [0002]
    2. Method of manufacturing the shaped body by pressing, according to claim 1, characterized by the fact that the block (14) connects a part that has a length of one-third or more of a peripheral length in cross section of the ridge line part (15b) starting from a connecting part with the groove bottom part (15a).
    [0003]
    3. Method of manufacturing the shaped body by pressing, according to claim 1 or 2, characterized by the fact that the shaped body by pressing has approximately the groove-shaped cross-section that additionally includes curved parts (15d ) continuous to the side wall parts (15c) and flanges (15e) continuous to the curved parts (15d).
    [0004]
    4. Method of manufacturing the shaped body by pressing, according to any one of claims 1 to 3, characterized by the fact that the forming by pressing is forming by bending.
    [0005]
    5. Method of fabricating the shaped body by pressing, according to any one of claims 1 to 3, characterized by the fact that the forming by pressing is drawing.
    [0006]
    6. Apparatus for manufacturing (10) a body formed by pressing, characterized by the fact that it manufactures the body formed by pressing made of a sheet of high tensile strength steel of 390 MPa or more which has approximately a cross section groove-shaped that includes a groove bottom part (15a), ridge line parts (15b) continuous to the groove bottom part (15a), and side wall parts (15c) continuous to the line parts ridge (15b), and in which an outward flange (16) is formed into a strip across the ridge line part (15b), at least a portion of each within the groove bottom part (15a) and the side wall part (15b) on both sides of it, starting from an end part in a longitudinal direction, in which the manufacturing apparatus comprises: a punch (11); a matrix (12); and a block (14) that presses and connects a forming material through pressing to the punch (11), in which the block (14) has a shape that connects a part to be formed in the groove bottom part (15a) and at least a portion of a part to be formed on the ridge line part (15b) in the forming material by pressing, and the block (14) is configured to press the part to be shaped on the ridge line part (15b) ) within a predetermined range from a root portion of the outward flange (16) in a direction in which the ridge line part (15b) extends in a longitudinal direction of the part to be formed in the ridge line part crest (15b).
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    同族专利:
    公开号 | 公开日
    ZA201409354B|2015-12-23|
    CN104364030A|2015-02-18|
    EP2865459A1|2015-04-29|
    JPWO2013191256A1|2016-05-26|
    US20150174634A1|2015-06-25|
    EP2865459A4|2016-03-23|
    JP5569661B2|2014-08-13|
    EP2865459B1|2018-08-22|
    CA2875789C|2017-11-21|
    BR112014031054A2|2017-06-27|
    KR101525374B1|2015-06-02|
    MX2014015377A|2015-03-05|
    CA2875789A1|2013-12-27|
    KR20140146235A|2014-12-24|
    RU2610643C2|2017-02-14|
    MX336402B|2016-01-18|
    ES2689298T3|2018-11-13|
    CN104364030B|2015-11-25|
    US9839951B2|2017-12-12|
    MY169897A|2019-06-12|
    IN2014DN10306A|2015-08-07|
    WO2013191256A1|2013-12-27|
    RU2015101812A|2016-08-10|
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    法律状态:
    2018-12-04| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-11-19| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2019-12-03| B25D| Requested change of name of applicant approved|Owner name: NIPPON STEEL CORPORATION (JP) |
    2020-05-26| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2020-07-28| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 20/06/2013, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2012-141127|2012-06-22|
    JP2012141127|2012-06-22|
    PCT/JP2013/066985|WO2013191256A1|2012-06-22|2013-06-20|Method and apparatus for producing press-moulded article|
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